JP2008131847A - Mounting structure of electric motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mounting structure of an electric motor capable of reducing time and effort required for the fixing work and the number of components and capable of achieving miniaturization of the electric motor and the base body. <P>SOLUTION: In the mounting structure on the base body 100 of the electric motor 200 equipped with a bottom cylindrical yoke 230, push-in parts 231 recessed to the inner part of the yoke 230 are formed on the outer peripheral surface in the vicinity of the open ends of the yoke 230, an insertion fitting hole 122 into which the open end side of the yoke 230 including the push-in part 231 is inserted is formed in the base body 100, and plastic deformation parts 124 entering the push-in parts 231 are formed by inserting the yoke 230 into the insertion fitting hole 122 and by plastically deforming a part corresponding to the push-in part 231 of a peripheral wall (a rising part 121) of this insertion fitting hole 122, thereby fixing the electric motor 200 to the base body 100. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a structure for mounting an electric motor including a bottomed cylindrical yoke on a base.

  Various attachment structures of the electric motor to the base body in the vehicle brake hydraulic pressure control device have been proposed. For example, an attachment structure as shown in FIG. 6 is known. In this conventional mounting structure, a flange 502 is formed at the open end of a bottomed cylindrical yoke 501 of the electric motor 500, and the electric motor 500 is attached to the base 503 by screwing the flange 502 to the base 503. It is fixed. In addition, mounting structures disclosed in Patent Document 1 and Patent Document 2 are known.

  In the mounting structure shown in Patent Document 1, a flange is formed at the open end of the yoke of the electric motor, the flange is inserted into an annular groove formed in the base, and the annular groove is caulked, whereby the electric motor is attached to the base. It is designed to be fixed.

  The mounting structure shown in Patent Document 2 is configured such that an electric motor is fitted into an electric motor housing portion (housing hole) formed on a base and is separately fixed by a fixing member.

JP-A-11-91527 Japanese Patent Laid-Open No. 11-78829

  In the mounting structure shown in FIG. 6 and the mounting structure shown in Patent Document 1, since the flange is formed on the yoke of the electric motor, the electric motor and the base are increased in size accordingly, and the brake hydraulic pressure control apparatus for the vehicle is increased in size. There has been a problem of incurring weight and weight.

  On the other hand, the mounting structure shown in FIG. 6 and the mounting structure shown in Patent Document 2 require a separate fixing member such as a screw 504 for fixing the electric motor, which complicates the structure and requires a lot of fixing work. There was a problem that it took time and effort.

  From such a viewpoint, it is an object of the present invention to provide an electric motor mounting structure that can reduce the labor of fixing work and the number of parts, and can achieve miniaturization of the electric motor and the base.

  According to a first aspect of the present invention for solving such a problem, in the mounting structure of the electric motor having a bottomed cylindrical yoke to the base body, on the outer peripheral surface near the opening end of the yoke, on the inner side of the yoke. Forming a recessed indented portion, forming a mounting hole into which the opening end side of the yoke including the indented portion is inserted in the base, inserting the yoke into the mounting hole, and the indented portion of the peripheral wall of the mounting hole The electric motor is fixed to the base body by plastically deforming a portion corresponding to the above and forming a plastic deformation portion that enters the pushing portion.

  According to the configuration as described above, the yoke of the electric motor is engaged with the mounting hole by so-called caulking that plastically deforms the portion corresponding to the pushing portion of the peripheral wall of the mounting hole to enter the pushing portion. Since it is stopped, it is not necessary to provide a fixing member separately, and it is possible to reduce the labor of fixing work and the number of parts. Further, since it is not necessary to form a flange for attaching the fixing member, the electric motor and the base can be reduced in size and weight. Further, since the plastic deformation portion enters the pushing portion, not only the axial direction of the electric motor but also the rotation direction can be fixed.

  Further, the invention according to claim 2 is characterized in that the pushing portion of the yoke protrudes inwardly on the inner peripheral surface of the yoke and positions and fixes a brush holder that supports the brush provided in the yoke. The electric motor mounting structure according to claim 1.

  According to the configuration as described above, the pressing portion for fixing and fixing the brush holder formed on the yoke can be used as the pressing portion for fixing the electric motor, and the processing work of the yoke can be reduced.

  The invention according to claim 3 is the electric motor mounting structure according to claim 1 or 2, wherein the yoke is press-fitted into the mounting hole.

  According to the above configuration, since a sealing effect between the yoke and the mounting hole can be obtained, it is not necessary to provide a separate sealing member, and the number of parts can be reduced.

  According to the mounting structure of the electric motor according to the present invention, it is possible to reduce the labor of fixing work and the number of parts, and it is possible to reduce the size and weight of the electric motor and the base.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the accompanying drawings. In each of the following embodiments, an electric motor used in a vehicle brake hydraulic pressure control device capable of performing anti-lock control, traction control, etc. is illustrated, but the application of the electric motor according to the present invention is described below. It is not intended to be limited to.

  First, the configuration of the vehicle brake fluid pressure control device U will be described with reference to FIG. As shown in FIG. 1, the vehicle brake hydraulic pressure control device U includes a base body 100 on which various parts such as a reciprocating pump P and an electromagnetic valve V are assembled, and an electric motor (driving means) serving as a power source for the reciprocating pump P. ) 200, an electronic control unit 300 that controls the opening / closing of the electromagnetic valve V and the operation of the electric motor 200, and a control housing 400 in which the electronic control unit 300 is accommodated.

  The base body 100 is a metal part formed in a substantially rectangular parallelepiped shape, and a flow path (oil path) for brake fluid, which is a fluid, is formed therein. Further, on each surface of the base body 100, four outlet ports 110, 110,... Are connected to an inlet port (not shown) to which a pipe material from a master cylinder (not shown) is connected and pipe materials to a wheel brake (not shown). In addition to the above, holes (holes) 111, 111,... For mounting electronic devices such as solenoid valves V, V,... (Hole) 112, 112,... Are formed. The holes communicate with each other directly or through a flow path (not shown) formed inside the base body 100.

  The electric motor 200 is a power source for the reciprocating pump P, and is integrally fixed to the rear surface side of the base body 100. The output shaft 210 of the electric motor 200 is provided with an eccentric shaft portion 211, and a ball bearing 212 is fitted into the eccentric shaft portion 211. Further, a motor bus bar 220 for supplying electric power to a rotor (not shown) protrudes above the output shaft 210. The motor bus bar 220 is inserted into a through-hole 130 formed in the upper portion of the base body 100, and a tip portion thereof is connected to a connection terminal (not shown) provided inside the control housing 400.

  The electronic control unit 300 is formed by mounting a semiconductor chip or the like on a substrate on which an electronic circuit is printed. Information obtained from various sensors such as a pressure sensor S and a wheel speed sensor (not shown) is stored in advance. The opening / closing of the solenoid valve V and the operation of the electric motor 200 are controlled based on the program or the like.

  The control housing 400 is integrally fixed to the front surface 101 of the base body 100. Although not shown, the control housing 400 is provided with an electromagnetic coil for driving the electromagnetic valve V, a connection terminal of the motor bus bar 220, and the like.

  As shown in FIG. 2, the electric motor 200 is mounted in a bearing hole 120 formed in the rear surface 102 of the base body 100. Hereinafter, a structure for attaching the electric motor 200 to the base body 100 will be described.

  The electric motor 200 includes a bottomed cylindrical yoke 230 serving as an outer shell. The yoke 230 is formed by pressing a metal material such as a steel plate such as deep drawing. Inside the yoke 230 is housed a core (not shown) formed by winding a magnet wire around a slot. The core is fitted to the output shaft 210 so as to be rotatable. A commutator (commutator) 241 is fitted to the output shaft 210 so as to be rotatable at a portion of the output shaft 210 on the opening end side of the yoke 230. A plurality of brushes 243 are in contact with the commutator 241 in the circumferential direction, and power is supplied from the brushes 243 to the commutator 241.

  Each brush 243 is attached to the brush holder 244 so as to be movable in the radial direction. The brush holder 244 is formed in a disk shape, and a through hole 244a through which the rotation shaft passes is formed at the center. The brush holder 244 is formed so that the brush 243 is arranged around the commutator 241 with a predetermined interval. The brush holder 244 is formed with a cylindrical rising portion 244 b that protrudes to the back side of the yoke 230. A brush 243 is provided between the inner peripheral surface of the rising portion 244b and the commutator 241, and a spring 245 is provided in a compressed state between the brush 243 and the inner peripheral surface of the rising portion 244b. Is configured to be biased by the commutator 241. A motor bus bar 220 for power supply is integrally connected to the brush holder 244.

  On the outer peripheral surface of the yoke 230, a pushing portion 231 is formed that is recessed inward at a predetermined distance from the opening end. The pushing portions 231 are formed at a plurality of locations at a predetermined angular pitch in the circumferential direction (six locations at a 60-degree pitch in the present embodiment). The pushing portion 231 is formed by pressing, and has a triangular cross section that becomes deeper toward the opening end side of the yoke 230. As the pushing portion 231 is formed on the outer peripheral surface of the yoke 230, a protruding portion 232 that protrudes radially inward is formed on the inner peripheral surface of the yoke 230. In the brush holder 244 described above, the engaging portion 248 formed on the outer peripheral surface of the brush holder 244 is engaged with the protruding portion 232 on the inner peripheral surface of the yoke 230 so that the output shaft 210 is rotated in the axial direction and the rotational direction (circumferential direction). The positioning is fixed. The engaging portion 248 is configured by a box-shaped notch portion formed on the outer peripheral surface of the brush holder 244.

A lid member 250 is provided at the opening end of the yoke 230 so as to cover the opening.
The lid member 250 is formed by forming a metal material into a disk shape, and a through hole 250a through which the rotation shaft passes is formed at the center. In addition, a cylindrical rising portion 250 b that protrudes to the back side of the yoke 230 is formed on the outer peripheral edge of the lid member 250. The lid member 250 is fixed to the yoke 230 by press-fitting the rising portion 250 b into the opening end of the yoke 230. At this time, the surface of the lid member 250 on the brush holder 244 side is configured to contact the bottom of the brush holder 244 on the base body 100 side. Therefore, the brush holder 244 is sandwiched and fixed between the protruding portion 232 on the inner peripheral surface of the yoke 230 and the inner surface of the lid member 250 (the inner surface of the yoke 230). A housing portion 250 c for housing the ball bearing 260 is formed at the center of the lid member 250. The accommodating part 250c is formed by extruding the center part of the lid member 250 to the base 100 side by press working such as drawing. An output shaft 210 is press-fitted into the ball bearing 260.

  Around the bearing hole 120 formed in the rear surface 102 of the base body 100, a rising portion 121 that rises toward the electric motor 200 is formed. The rising portion 121 is formed in a cylindrical shape, and an inner portion thereof constitutes a mounting hole 122 into which the opening end side of the yoke 230 is inserted. That is, the rising portion 121 constitutes the peripheral wall of the mounting hole 122. The rising portion 121 has an inner peripheral diameter that is substantially the same as the outer peripheral diameter of the yoke 230, and is configured such that the yoke 230 is press-fitted into the mounting hole 122.

  The rising portion 121 is formed such that the depth dimension of the mounting hole 122 is longer than the distance from the opening end of the yoke 230 to the pushing portion 231 by mounting the yoke 230 in the mounting hole 122. At this time, the pushing portion 231 is positioned in the mounting hole 122.

  Then, the electric motor 200 is fixed to the base body 100 by so-called caulking fixing, in which a portion 123 of the mounting hole 122 corresponding to the pressing portion 231 of the yoke 230 is plastically deformed to form a plastic deformation portion 124 that enters the pressing portion 231. Is configured to do.

  Specifically, after the yoke 230 of the electric motor 200 is inserted (press-fitted) into the mounting hole 122 of the base body 100, the caulking jig 150 is moved to the rising portion 121 (the mounting hole 122) as shown in FIG. After pressing against the surface of the tip of the peripheral wall), as shown in FIG. 4B, it is pressed toward the bottom of the mounting hole 122 (base 100 side). The caulking jig 150 has a plurality of convex portions 151 protruding toward a portion 123 (see FIG. 3) corresponding to the pushing portion 231 of the yoke 230. As a result, a plastic deformation portion 124 is formed in the hole wall of the mounting hole 122, and the plastic deformation portion 124 enters the pushing portion 231 of the yoke 230 and locks the yoke 230, so that the electric motor 200 is caulked to the base body 100. It is fixed so that it cannot be removed from the mounting hole 122. At this time, since the pushing portion 231 has a triangular shape that becomes deeper toward the opening end side of the yoke 230, the plastic deformation portion 124 moves toward the bottom side of the mounting hole 122 toward the yoke 230. Is obliquely deformed so as to be pressed toward the bottom side of the mounting hole 122. Therefore, the plastic deformation portion 124 can enter the pushing portion 231 without any gap and the opening end of the yoke 230 is pressed against the bottom of the mounting hole 122 without any gap, so that the electric motor 200 is securely fixed to the base body 100 without rattling. be able to.

  Further, since the pushing portion 231 is intermittently formed in the circumferential direction of the yoke 230, it can be fixed in the circumferential direction as well as the axial direction of the electric motor 200, and the yoke 230 rotates. Can be prevented. In addition, even if the pushing part 231 is single, it can be fixed in the circumferential direction of the electric motor 200 by the plastic deformation part 124 entering the inside.

  Further, since the pushing portion 231 is originally formed on the yoke 230 for fixing the positioning of the brush holder 244, it is not necessary to apply special processing for fixing the electric motor 200 to the yoke 230. The manufacturing process of 230 does not increase. In addition, when it is desired to increase the fixing strength between the base body 100 and the electric motor 200, it is only necessary to perform a simple process of additionally forming the pushing portion 231 and forming a large number of plastic deformation portions 124 corresponding thereto.

  In the present embodiment, since the yoke 230 is press-fitted into the mounting hole 122, the fixing strength between the base body 100 and the electric motor 200 can be further increased, and a sealing effect is provided between the mounting hole 122 and the yoke 230. You can have it. Therefore, the sealing member between the base body 100 and the electric motor 200 can be omitted, and a reduction in the number of parts and a reduction in processing labor can be achieved.

  Further, since it is not necessary to form a flange 502 (see FIG. 6) for attaching a conventional fixing member to the yoke 230, the maximum outer diameter of the electric motor 200 can be reduced, and the electric motor in the base body 100 can be reduced. The area of the mounting portion of the motor 200 can be reduced. Therefore, it is possible to reduce the size of the base body 100 and the electric motor 200, and further to reduce the weight thereof. Furthermore, it is not necessary to provide a fixing member (see FIG. 6) separately, and the labor and time of fixing work can be reduced.

  FIG. 5 is an enlarged cross-sectional view of a main part showing an electric motor mounting structure according to another embodiment of the present invention.

  As shown in FIG. 5, in this embodiment, an O-ring 246 serving as a seal member is provided between the brush holder 244 and the inner peripheral surface of the yoke 230. An annular groove 247 is formed on the outer peripheral surface of the brush holder 244, and an O-ring 246 is provided in the annular groove 247. The O-ring 246 is made of a resin such as rubber and is provided in a compressed state between the inner peripheral surface of the yoke 230 and the brush holder 244. Since other configurations are the same as those of the embodiment shown in FIGS. 1 to 4, the same reference numerals are given and description thereof is omitted.

  According to such a configuration, since a sealing effect can be provided between the brush holder 244 and the yoke 230, the sealing performance of the electric motor 200 can be further enhanced. Further, the electric motor 200 having such a configuration can be applied even when the yoke 230 is not press-fitted into the mounting hole 122.

  Note that the form and position of the seal member are not limited to those shown in the present embodiment, and may be changed as appropriate.

  As mentioned above, although the form for implementing this invention was demonstrated, this invention is not limited to the said embodiment, In the range which does not deviate from the meaning of this invention, a design change is possible suitably. For example, in this embodiment, the engaging portion of the brush holder 244 is used as the pushing portion 231 for fixing the electric motor 200, but the pushing portion may be separately formed on the opening end side of the yoke. Good. With such a configuration, the length in the axial direction of the rising portion 121 constituting the mounting hole 122 of the base body 100 can be shortened, and further weight reduction of the base body 100 can be achieved.

It is a disassembled perspective view of the brake control apparatus for vehicles. It is sectional drawing of the brake control apparatus for vehicles to which the attachment structure of the electric motor which concerns on embodiment of this invention is applied. 1 is a rear view of a vehicle brake control device to which an electric motor mounting structure according to an embodiment of the present invention is applied. It is sectional drawing for demonstrating the processing state of plastic deformation, Comprising: (a) Sectional drawing which showed the state before a process, (b) is sectional drawing which showed the state after a process. It is sectional drawing which showed the attachment structure of the electric motor which concerns on other embodiment of this invention. It is a rear view of the vehicle brake control device to which a conventional electric motor mounting structure is applied.

Explanation of symbols

100 base 121 rising part (peripheral wall)
122 mounting hole 124 plastic deformation part 200 electric motor 230 yoke 231 pushing part 243 brush 244 brush holder

Claims (3)

In the mounting structure to the base of the electric motor provided with the bottomed cylindrical yoke,
On the outer peripheral surface in the vicinity of the opening end of the yoke, a pushing portion that is recessed inside the yoke is formed,
A mounting hole is formed in the base, into which the opening end side of the yoke including the pushing portion is inserted,
The yoke is inserted into the mounting hole, and the electric motor is fixed to the base by forming a plastic deformation portion that plastically deforms a portion corresponding to the pressing portion of the peripheral wall of the mounting hole to enter the pressing portion. An electric motor mounting structure characterized by:   2. The electric motor according to claim 1, wherein the pushing portion of the yoke protrudes inwardly at an inner peripheral surface of the yoke, and positions and fixes a brush holder that supports a brush provided in the yoke. Mounting structure.   The electric motor mounting structure according to claim 1, wherein the yoke is press-fitted into the mounting hole.

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